Cleaned the carbs and synched them but it still has a mid range bog/miss. Runs good from idle to WOT but slow down and get it the mid range area 4 to 5000 rpm, it bogs and sounds as though it is 1 cylinder. Any ideas??? Thanks in advance.
don't think it's clutching because the clutch side plug is oily so I suspect carbs.phazerguy said:Check clutches, clean them well, replace any worn springs and secondary sliders, try tightening secondary spring a little.
yes, they were out once but my dad didn't realize there were ports and jets under those black plugs so he cleaned what he saw and put them back in to no avail.SRX540 said:CARBS and or CLUTCH you gotta clean those butterfly yamaha carbs real well sometimes......